Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce433f7069d6f104…

MALICIOUS

PDF

67.5 KB Created: 2021-02-25 22:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 14784cbce56913294b7d3108ef3f9791 SHA-1: d43f7efa7e38490a747cdfab4e860c7b7f802c64 SHA-256: ce433f7069d6f1045fde343daf9e2aa66b5b53811b0ac629aeb10fbcbbb280a8
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/strik?utm_term=men%2527s+health+best+workout+videos PDF link annotation
    • https://sobomevoza.weebly.com/uploads/1/3/0/7/130739746/wewavesudokasi-siwezazuwuduti-gugorebugotif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494165/normal_5feda0c20cb6f.pdfIn PDF document text
    • https://xogiwudib.weebly.com/uploads/1/3/4/7/134715522/tokutedogiri-fozanur-nozupowejod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371553/normal_6031965496f64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480170/normal_6019ac484b191.pdfIn PDF document text
    • https://cdn.sqhk.co/geroterunetu/JQiihiE/busidimiviramir.pdfIn PDF document text
    • https://cdn.sqhk.co/niwexifa/hrojhlN/sodupumaduj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367964/normal_5fe3e6a5717bf.pdfIn PDF document text
    • https://tafubevodila.weebly.com/uploads/1/3/4/0/134016741/7116191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428069/normal_600651a67028f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368227/normal_5ff26b8e914a1.pdfIn PDF document text
    • https://lesinagin.weebly.com/uploads/1/3/1/4/131454304/28cb9da8474e.pdfIn PDF document text
    • https://cdn.sqhk.co/lajefage/fIziigi/first_world_war_posters_for_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/sedowedi/buderus_logamax_u124_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/star_wars_battlefront_ii_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/zelazivuzojezijafova.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC72 5308 bytes
SHA-256: dc7fcca2ad8d3da484e3c6cfaee9ccb52770e046bb8e505d285bd200d2ec45cd
font_01_sfnt_off0000de9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9E 10016 bytes
SHA-256: 433199e787f0ec86f7209f9f86a88c4020d634aeec431f0d6ffecf1c8740bcbe

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